WavAudioSource.cpp
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WavAudioSource.cpp
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	#include <echo/Resource/WavAudioSource.h>
	#include <echo/Resource/RIFFReader.h>
	#include <echo/Audio/AudioBuffer.h>
	#include <iostream>

	namespace Echo
	{
	WavAudioSource::WavAudioSource(File waveFile) : mDataSize(0), mDataBuffer(0), mLastNotAppeneded(0)
	{
	if(!mRIFFReader.SetFile(waveFile))
	{
	ECHO_LOG_ERROR_LOCATION("File " << waveFile.GetActualFileName() << " is not a RIFF file.");
	return;
	}
	mRIFFReader.AddChunkTypeProcessor(0x20746D66,this,&WavAudioSource::_ProcessFMT); //'fmt ' chunk
	mRIFFReader.AddChunkTypeProcessor(0x61746164,this,&WavAudioSource::_ProcessDATA); //'data' chunk
	//We want to know the 'fmt ' first this should take us there
	//Process to 'data' block
	while(mRIFFReader.ProcessNext() && mDataSize==0)
	{}
	}

	WavAudioSource::~WavAudioSource()
	{
	delete [] mDataBuffer;
	}

	bool WavAudioSource::_ProcessFMT(RIFFReader* reader)
	{
	mRIFFReader.Read(&mWaveFormat.mAudioFormat,1, mRIFFReader.GetCurrentChunkSize());

	if(mWaveFormat.mAudioFormat!=1) //If not PCM
	{
	return false;
	}
	return true;
	}

	bool WavAudioSource::_ProcessDATA(RIFFReader* reader)
	{
	mDataSize=mRIFFReader.GetCurrentChunkSize();
	mDataBuffer = new u8[mDataSize];
	return true;
	}

	void WavAudioSource::Restart()
	{
	mRIFFReader.ReturnToChunkStart();
	}

	u32 WavAudioSource::GetSampleRate()
	{
	return mWaveFormat.mSampleRate;
	}

	u32 WavAudioSource::GetBitsPerSample()
	{
	return mWaveFormat.mBitsPerSample;
	}

	Seconds WavAudioSource::GetLength()
	{
	u32 length=mDataSize;
	length/=mWaveFormat.mNumChannels;
	length/=mWaveFormat.mBitsPerSample/8;
	f32 lengthSeconds=static_cast<f32>(length);
	lengthSeconds/=static_cast<f32>(mWaveFormat.mSampleRate);
	return Seconds(lengthSeconds);
	}

	u32 WavAudioSource::GetNumChannels()
	{
	return mWaveFormat.mNumChannels;
	}

	u32 WavAudioSource::Read(void* rawBuffer, u32 numBytes)
	{
	u32 numRead=mRIFFReader.Read(rawBuffer,1,numBytes);
	if(mRIFFReader.IsReadAtEndOfChunk())
	Restart();
	return numRead;
	}

	u32 WavAudioSource::UpdateBuffer(AudioBuffer& buffer, u32 numBytes)
	{
	u32 steps=0;
	u32 written=0;
	steps=(numBytes/mDataSize);
	for (u32 s=0; s< steps; ++s)
	{
	u32 numRead=mRIFFReader.Read(&(mDataBuffer[mLastNotAppeneded]),1,(mDataSize)-mLastNotAppeneded);
	if(mRIFFReader.IsReadAtEndOfChunk())
	Restart();
	u32 r=buffer.Append(mDataBuffer,numRead);
	written+=r;
	mLastNotAppeneded=(mDataSize)-r;
	if(mLastNotAppeneded)
	return written;
	if(mRIFFReader.IsReadAtEndOfChunk())
	Restart();
	}
	//Last step will be the remainder
	numBytes=numBytes%mDataSize;
	if(numBytes>0)
	{
	u32 numRead=mRIFFReader.Read(&(mDataBuffer[mLastNotAppeneded]),1, (numBytes)-mLastNotAppeneded);
	u32 r=buffer.Append(mDataBuffer,numRead);
	mLastNotAppeneded=(numBytes)-r;
	written+=r;
	if(mRIFFReader.IsReadAtEndOfChunk())
	{
	Restart();
	numBytes-=numRead;
	u32 numRead=mRIFFReader.Read(&(mDataBuffer[mLastNotAppeneded]),1, (numBytes)-mLastNotAppeneded);
	u32 r=buffer.Append(mDataBuffer,numRead);
	mLastNotAppeneded=(numBytes)-r;
	written+=r;
	}
	}
	return written;
	}
	}

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